Willow Oak

Quercus phellos

Willow oak is the workhorse of Washington's National Mall, planted there by the thousand along avenues and lawns. We map 3 of them, in 1 city.

The second largest tree Casey Trees measured in the city in 2023 was a willow oak in the U.S. National Arboretum, 287 inches round, beaten only by the Battery Kemble chestnut oak, and the Arboretum's arborist says it is near the end of its life. Across the line in Maryland, the Park Service registers a willow oak in the field at Oxon Hill Farm as likely planted in at least the early nineteenth century, about 4.5 metres round. A forestry blog says it was standing the night the Capitol burned in 1814; the register does not go that far. Back on the Mall, south of the Vietnam Women's Memorial, a tight ring of willow oaks is either a century old or fifty, and neither source will choose.

Washington DC

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Over 3,800 old trees worth the walk

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